Dynamic compensation of rotating blades imbalance

The purpose of this paper is to research an effect of factors that are creating an imbalance of fan rotating blades and to estimate the possibility of compensation for this parasitic effect. For this purpose the measurement system including hardware and software was developed. Measurements of vibrations and dynamic pressure of rotating two-blades fan, blades profile and lift force parameters at various rotation speed were performed. This paper presents compensation possibilities when mechanical and aerodynamic imbalance occurs

Measurement system for analysis of autogyro rotor imbalance

This paper presents the measurement system that is designed for measurement and analysis of mechanical and aerodynamic unbalance. These types of unbalance occurs in mechanical systems composed of high radius blades, including rotorcrafts – autogyro. This work presents structure of the measurement system, processing and visualization process of measurement data

Effect of dynamic regime of rollers of pocket folding machine to quality of printing products

Measurements of dynamics of rollers and their segments in the direction of transverse axis of rotation of eight cassettes of folding machines were carried out in this work. Measurements were carried out in pre-selected positions of rollers and their segments for two different rotating velocities of the rollers. In the first case the roller was rotated at 9 m/min velocity and in the second – at 90 m/min. It was determined that before renewal some rotating rollers for the investigated velocity of rotation of the roller 90 m/min experienced the displacements up to 80 μm. The displacements (beatings) of the rollers and their segments originating during the process of rotation in the direction of transverse axis of rotation have substantial effect to the quality of folding of printing products. Numerical investigation of the rollers was performed by using the axisymmetric model. Supplementary stiffness from the static loading caused by centrifugal forces is taken into account. The eigenmodes are calculated. The standing waves on the surface of the roller are investigated

Measurement of vibrations of rotating elements in a folding machine

The measurements of vibrations of rollers and their segments in transverse direction to the axis of rotation of folding device were carried out in this work. The displacements of rollers and of their segments originating during the process of rotation in transverse direction to the axis of rotation were determined. Based on experimental results plane strain problem was investigated. Also bending vibrations of the rotating element in a folding machine were investigated. Supplementary stiffness from the static loading caused by centrifugal forces was taken into account. Eigenmodes were calculated. Comparison of experimental and numerical investigations is performed

Measurement of vibrations of rotating elements in a folding machine

The measurements of vibrations of rollers and their segments in transverse direction to the axis of rotation of folding device were carried out in this work. The displacements of rollers and of their segments originating during the process of rotation in transverse direction to the axis of rotation were determined. Based on experimental results plane strain problem was investigated. Also bending vibrations of the rotating element in a folding machine were investigated. Supplementary stiffness from the static loading caused by centrifugal forces was taken into account. Eigenmodes were calculated. Comparison of experimental and numerical investigations is performed